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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1413b8fe847e75021530d8fb1325b255635ba2e46acb2b77260a897462969a4d' 
  AND token = 'AX9h90/zgVHx6Ebs99s6qoXmRzlWZdjj+a0oORYfs5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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