SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1bed84c73606d422d2541c05d1a43d9757695c5e96b194f3c58f621399ecfa' 
  AND token = 'KmenDAOyhUYwmaqcqbAf+x9jJsqZNwgqzOx6JrOJaX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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