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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f92ad9e922c0f79caa1ffb5a8343998aaa8e6101117dbd2b89240e239c72ae' 
  AND token = 'YrMyQJfYhgbnWrEpdTn0Z40rVrAqh65tkQg9f34IhKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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