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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab57c83639c861e6e201f6bdd75ecf47c678520471f59130603801490d112f4' 
  AND token = '8OhRXivdzgvU+HZxfXH3SULl6KDRnrFb+aZh0ywfFE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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