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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59598ba82ad1a20d052d9eb733eb033639f6c00eda6432387852aa04952d96b4' 
  AND token = 'snEPtyL7jVoEgwi1nsoy2QVjpVN/pIsOQM8sE+XAfdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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