Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed0143765a149c32fd55904ee9de65ceb31c9d8302af820b7ff4c313b321305' 
  AND token = '2rovCS95n/X4NjtGXukpGafF4n4p7xEiLjEHGwFRguE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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