SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe91e25f99facad3bdc378c7466cdde1594e40b6495feba53f2284c410b26176' 
  AND token = 'iCwkaGD+nWzN/MQKJKq0v5nw0tv7Vlveso1Z8MHK9tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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