SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae6013c350d4d2bc1aae649f372e6c4b2f992238c98dea1710e4774a3b9a3fc' 
  AND token = 'yBZMwJTjL+8jkzoxUgO9ci/JvaWXgUVx03HToKJxU6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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