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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6512f4a54a77e49f11c434032103112092aa30a6df39b96d242f741af8bddf30' 
  AND token = 'oEjGDgztdKmHg9Fset0aMV+QCvPs2rkkgF3cxE3kUvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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