SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7feeb425ae7c59df4fd941e1e0a3dc2cc4bb69b4b38469017c4ac06be21282' 
  AND token = 'bfZNGIv+QmZE7FR8naqwh+EForh6giPQSZTz/jnr2wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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