SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f082b06bf947b03ba67caa35c4679e820294bd224bf1d5e48f8ac132a3e11a' 
  AND token = 'AiuwnQM/ssx4QxuOMZB3sEv+YLlkz8HBcFNx/q/x4w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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