SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d27d29bd24670da0df61b91b5ba195660a508ec31e28cda6a5bee9ca9f3743' 
  AND token = '/g6sl2FTmZwUVzK/QIenA3ol0cfuDEkq+mTgfsVFGrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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