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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a895d1cc9dbd76077c92118164d4ee77479847299126a4e16a79fe4f7b47b8c7' 
  AND token = 'H9ZFFBgsImNQJbugBL5amj60aHuZlzC8W9YUtp+QlHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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