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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939458e5578e04a665019d22901c076aa9a19831ec471e7dbfbee9e01f11fd56' 
  AND token = 'ywvm84eDvJ6Pq6HF7rYJnYp/3wI9QgshF9Io7ph2OXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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