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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0222a4984527039e759a14584853b8e0abc4e16dcabae4f2aec6d2656b135ab8' 
  AND token = '8g1KJ6Ni5vsCSv3YrJkjqUaIHNu9n2+RuAKQ27JRcT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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