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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55da8fc127729815257ef022cfc4be201d8f27a98dcd9ad6acb4937aa494e104' 
  AND token = 't1ErGGg3lI39pTJfaaHe6TVNHmkZshUB+uZpf/Z6nAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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