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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2e10002984ee7cb10a58ba348fc9daf44286e1733ca1a55a7dba49fe4fa214' 
  AND token = '8fY5va7JvXHe2Gp85danqXaajzQpgfMvalcUl86YYuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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