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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620bddcdca9ba03dee41cec23e30828d0c71eb55badcf86e069302471dc00bb9' 
  AND token = 'J4Gvn6n5313E2n3UtQmf5UIwaG9FUYGgMSZU3KwqId8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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