SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444b7e28df8c7a8b59d53b6dcfa8359d15bfcb4f2c840fd5c86e0b79418df743' 
  AND token = 'YD5Q5IS3JV95EPD6F2l/YrYjAKGWjjHfwK/g9ybEP6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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