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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b404a3836c717b1d0cec2d8b71efb2049cdfc2073f4f4dc3953a416f4dfb4fe6' 
  AND token = 'uY0FIE03vkNi12vtbpOuYZqs0GxqbnfGmKUdK9al2Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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