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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0bb67ed58e81858ee1e94615b129ff19757eeb1eaf1cfdc536afa5dad20576' 
  AND token = 'gcZru84NUImEri3FUBJAjR7RXDFc3JEBtBbJM5LvfZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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