SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4147c5448f0b3cacd6aeaef8be4a9f0faec62d8b9cf53f41c7de4f9ddb488c' 
  AND token = 'EFdKKbiyxfVrn7wmIvzwVUgdc92gCtVGVOQMQ9yYnXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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