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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b79b6a4e895054125242c1b5c81a293f9910db4290c74adfafa73c43907eef' 
  AND token = 'e5VyJxV56jf0Hq5oZF5EeUmjTFzf8qq8FapW/E3WMZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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