SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ce9d45b54df5537e76fe8a5ca032a0486d62c5b9d3ec32cddfd208f39fb7f1' 
  AND token = 'LvQKjbYuYqY8SdikKjihzz5YZp2xCiEkYLVKWuA5p3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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