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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684fc77b4b7b6898ff63c52680dad54ff3ed77bcd238b2b736de0b8cbe1a4deb' 
  AND token = '6WOn4LXqCjeYQYJheHhtLK6oz2tt6vdTZEWMQXNHgvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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