SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da4ea134425b7d7ecd5aaf721205d56caa11ef9585c8dca4a0f7136df7e288e' 
  AND token = 'ZYc1TY6sSVfCl/1PTzhvzV+ZiqPHUufppgR8tSBebfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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