SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cca912257849fd223ba137ff0db3a724846b874bec8c1ec5ca3bdbf9cdab67f' 
  AND token = 'CKQ5uBvXpzMeqWRW8CwX6ymIuLlHDSGnR40jAVMFL+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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