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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab264ce575bf8657a083404f2bb479b5723595163e082c65fd36592f23d497d' 
  AND token = '9q1soAxaNXCGiNbTHaKQr2HSqcHn8NWET6qZJpGCAck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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