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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747ccc8544b5e436f61ca7f96386ccf9612c54bf463a8ad6e5d0788ba0cb6957' 
  AND token = 'GtyqdlQatiRX6Wszc5efpAp8UmuwGny/+MVi5+wowjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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