SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b41e3af9f748897199dcdf7a2b6b11207369055ec9bdcebd59a0165c5908364' 
  AND token = 'NOro81JhjFRoxbq5Ip8WuwRN9Ol1B/6KgTCv+DTK39Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00179

JSON explain

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