SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84e1f62118b1f576a2c26998ae9b95ae7db133eb5fe7d57f4fbc4d940ca7cff' 
  AND token = 'aZdrN2zOlBwV+UL/xuIGRH2/sOw8n3QNrW/yVZTUs9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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