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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5491a030446256859ea6d304db738671d8b66d37eebc4b115ec8127e10b82325' 
  AND token = 'oIvlB/+zfbD2269DmpHmU0Paz5FwDA/6ugoRc36K9Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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