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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a29d79eb9b43aa3db7f87cf5706fa13fbcb8aa325ed63f9fa1dad7cbedce01d' 
  AND token = 'm9Huldl8XjLQwvxfQhl3J8Zu3u2sl8DCC3AUIhB0LiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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