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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dce7593b87fc3a316384b7bd9a1cf0f61fadaf53a3d89dce5a65e004462a6cd' 
  AND token = 'wfTmOa3yH9UwlT+PT0VHytCuzMWuazNMngW9OiIOMdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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