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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a49ae9c8a771d9913d4e1948a9de5a9c1d4fa306aa7de914fd9eb66b3b0b3c' 
  AND token = 'yJyUACycQvo8H2N012CENg1hu74WF5Qf8VumZkSQPAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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