SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05530763b11d2c6d07e431bfc5d5adcf8c695192c6ed67253edc6b4b8fec8de2' 
  AND token = 'j4Bj+YfGXsTqIHRHL4i/TL3/F0hY+gn90fQjiUSQRQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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