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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5fc62d54c7b3b5f8fc640cc232eeb91d6ea0a245eb966b37dcf0a5d5eaa0ac' 
  AND token = 'it+NRUgQrD5+u9F3lA1P9p2J/72Tct0ZlZbJHTdmNdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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