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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce9d8b1701bb687836d37e413c41887c46f1230b7379b1f876e0acec80e2d25' 
  AND token = '/Mq+Ga20rZa1y6iOl4zurJAxlC+o+F6Z7SoutLxvvWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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