SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e081db53dc5f535baf8228b007c25ae68d04a72f1897450bc2211c756cac1a' 
  AND token = 'hf/Mv0E8g+8icDqtC1CeOj/3OSpIqoByZPE7PVjPKrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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