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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f04bee7f80e6902ec98509aed6d5882a474b9aa6c517f94893df6f1b156dd60' 
  AND token = 'yK6mIhuDUN7A1uDLWc2F6GrhQe2BdCXtmRVU2sin7q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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