SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7175824a1615224c6ce69378d6ddd5779d06cf0bdf2ad9db644169379f391893' 
  AND token = 'NDTQcNCpuhHkb369fdsOIqw/jVfbeAaqpJ1K+y/pBG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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