Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef019f989cbd404bbc94e601f66b4bd37487e5c1479d8fe24e0919bfb3b23801' 
  AND token = 'CRj+AsPI2gsIeT4gRSRdMw3ay34DmPFxktwMJC3FNCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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