SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674562c7e0c6ba744bd9579f291fdac0a453bde24c9669e73508c39d5687dea8' 
  AND token = 'QaVsOdXw0fFgwCwfoI8k4YKkB2pZgJSsGKHYa79Vzu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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