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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd39b748f3950e3035ec7ee891abb93a50e7b603966ee2463ac98ed778ea6f9c' 
  AND token = 'YtvoF4ikhJACovZN6uMsif3frBklprwXdBHHBrauAvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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