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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3c60ed398257c53fc499986438c1d0b5671fdbca8d86a5ffd98a87c3841313' 
  AND token = 'GOgch3CWkmeV6IM4fg08zSBg9QMVwJ7mQLz+036Jols=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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