SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775e61be1c1614df82c4bf454559cf488c3ebcdfa4238a02d94383b4ac6b2b36' 
  AND token = 'qvhtwMizHdJ8F+e1sFVspFva0/NV6ceOMIZEm1IKVHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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