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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f92d4d0bc6a4c56181e2d4d5081ba4a635edb8692597f25ff0173d602aaa43' 
  AND token = 'R7dAT9h8hBtxorg3TapjiXiS7oLDlcTqV6Y210srWtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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