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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbb55eddef5675baae7e047c553fb494c6fb1026f82cb818b7c623dcf5f4309' 
  AND token = 'f7JUvV0nrJFUZb7TI2l8XeKIWyqqdxuPnw5Ymgw4iaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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