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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d64109c683adc2c7a1a206aa93bde0670a9467ee34a0cdd261b3b3e36ee2bd' 
  AND token = 'BH49GC7zG0bozf3bWK/AFwdNnHdc8QOyIGGiq6DToHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}