SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418b560aad32775990ea127653aeff813aa61af7f524593c7956146f4dd6fcc9' 
  AND token = 'FQYQKrTjVVqtVJdjflQh3T+DrgWMNWzzbSBYy1HdRrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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