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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38afeb38ab7ce6c351198bc5bbf1bdcce23bbd98468bf31f589cf33bccbc0ebe' 
  AND token = 'JIOTZaN5Sjq6vbRlcaK2Nl9euBdbEDDTsuOP0Hdtlrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00343

JSON explain

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