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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d605fc7c6595ee824651ea2982fcacb96679def9d510d0a7e19f13baed086e' 
  AND token = 'ff644mFdm3hsyRxtLtXKWdCt2YP1fsb9j7wRGMgIES8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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