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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f819b62f93e4f9c008b5aa4342e1d0d92bd75e59aa6fc4fc6b399f8ca94e23f7' 
  AND token = 'nBu2MC5hbx2EhCGHtdCPV9DXDMlZLwZkLr/XDiJfkX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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