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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a60e199ab9fc2006f564a42becb17be88a50a05119ae1eb3de868348285c8c' 
  AND token = 'gK3nivmK0+bb6CIdLxwNiTHh0hGxT4/IvgDzScEvE+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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