SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f02a051434578a9ea3672d6edbe8145a9058b758ac1f5c76289467b7115c23d' 
  AND token = '1OnEqSR1JG3BLu9rgfb/jNonwZy1Bo15ydh63MvqxmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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