SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052434233d4b549783711a12e89c1db9ebc358ed698fff5c3ed0619ee59b1090' 
  AND token = 'B2Bq/qegTekZvau+uKWucoB2+Yjp07RIBVC+gZpO6/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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