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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e8e0c0561bcffb9790da4d0beb7aa99bca5bb54254d98c3b91e9008644a04c' 
  AND token = 'zGzvdFmBbft+Jo7ueS3jader8tW3PldrcqvbTMm9XWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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