SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467445b3f06ffee777221e356dcefb88d1901cbc1a3dc2fe2b1f5f399b9a0a25' 
  AND token = 'IK6uJNhaZtsuoN3+zos+YxUNlCIqul8kUWswYHXuZr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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