Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fbd3744feaee235bec244b80070c4182f3b40a4b655560bf27a68258d63160' 
  AND token = '0695smlfC+itk65cwY9bZdkqSO/sWMeSSbWFzbubkEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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