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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa50cbdbd25a307076a6435333a1245aeee8c3fc0c73197d60659aefc2bf0d6c' 
  AND token = 'n3PKjGg1xdGaPIwZiBLrzqidpPcxJEIG14uE+1SKnkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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