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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310d15e4e19990d70f85726aded4e0bacaa7863be7b1a71c99a91fa823ebe3fd' 
  AND token = 'mO+GQAt9RA4AA9I2PLEt0neeAcUMNeUum8MXW7ik2t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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