SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebed87d61dda5849afe4dfd19e6c4b857dc7d19651964e1897c5ca8b2b9959f2' 
  AND token = '5Dr4FLB3hg25CdxC9kJv7Y5KBzPf4fmWHF+GJGKeDwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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