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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f113e05823ee759cf14fc9f63997563a6803d0ec601bb3f59b2520805e65118' 
  AND token = 'hKMemOKU5bPoQeGa5I/51QlJ6z+YTZxluwNzQ04nMV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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