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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff41a22978461b230795d8e64ca17bb39ea5a20599e2fdeeb366e7ad48796f8' 
  AND token = 'OU7AL8SSI+wNrfKuRHdH7Qk8bKjuldWZAA7sI2n1iqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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