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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6b7aec6cc408e10e034f12ee8fb0171e8e3d0c3b38435a88dfdfe223852be0' 
  AND token = 'db9chSp7aBEzVb5VkuOiN7vp2r1wh3IYHBYghg0oZz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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