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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd25c60817c5a713b47656c9446c714850b1d1af1692a0e4de586c70cd34c6a5' 
  AND token = 'fgVl5pxdgo9Kik5FacHn/7Nht+gjtugyQCqKDTiDkc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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