SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59f7a4afb8f1ed5293d9bf53ed7c18b04bfb0d6b6adaec32034776d022949ea' 
  AND token = 'hC/9yR1gqY0lo1+XGUMM+wJoLL2+J0gYXV3khkqoc/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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