SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e8c73e5637f189c5ffd534df3c868828394f825b56e2e7cde1d7dc9aaa304b' 
  AND token = '92JzNWyXlvBKrrUvEDYmWOV0MS78mfosLVG44PJhUDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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