SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32e2f36a6df0de76cf83cde95ef74ffa8b2d2f41ac97db68e2dc1bbb12fd0a3' 
  AND token = 'YOzo54+rDfuhwMhw6J1GuQahJdQIPeKMZAHQkWwzB9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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