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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2905adfe7679c9d0573084cef4049d9a7d90eb2d6e448e822f771febb9d40b' 
  AND token = 'mcfNZ/u7jTml3d8YP+aosrSezEa5I8LTr5jrPH5+HF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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