SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a44c6f65228a2405f26dfdcf68169b9bf0960ba97e0154fcd332606311edd4' 
  AND token = 'kTZiBVGIYArFyhDfewLqu9l7hSQ/iyjdtMZjQoug9Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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